added I2C example

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diff --git a/Examples/I2C_simple_demo/I2C_simple_demo_master/I2C_simple_demo_master.ino b/Examples/I2C_simple_demo/I2C_simple_demo_master/I2C_simple_demo_master.ino
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+++ b/Examples/I2C_simple_demo/I2C_simple_demo_master/I2C_simple_demo_master.ino
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+#include <Wire.h>
+
+#define SLAVE_ADDRESS  0x09
+#define DELAY_TIME             200
+
+size_t i2c_write(uint8_t address, void *data, size_t size);
+size_t i2c_read(uint8_t address, void *data, size_t size);
+
+void setup()
+{
+       Wire.begin();
+       Serial.begin(9600);
+}
+
+void loop()
+{
+       static bool led_status = false;
+       uint16_t pot_value = 0;
+
+       Serial.print("Turning LED ");
+       Serial.println(led_status ? "on": "off");
+       i2c_write(SLAVE_ADDRESS, &led_status, sizeof(led_status));
+       led_status = !led_status;
+       
+       i2c_read(SLAVE_ADDRESS, &pot_value, sizeof(pot_value));
+       Serial.print("Received pot_value = ");
+       Serial.println(pot_value);
+       
+       delay(DELAY_TIME);
+}
+
+size_t i2c_write(uint8_t address, void *data, size_t size)
+{      
+       int error_code;
+       size_t bytes_written;
+
+       Wire.beginTransmission(address);
+       bytes_written = Wire.write((uint8_t *) data, size);
+       error_code =  Wire.endTransmission();
+
+       return error_code ? 0: bytes_written;
+}
+
+size_t i2c_read(uint8_t address, void *data, size_t size)
+{
+       size_t bytes_received = Wire.requestFrom(address, size);
+
+       if (bytes_received == size)
+       {
+               for (size_t i = 0; i < size; i++)
+               {
+                       ((uint8_t *) data)[i] = Wire.read();
+               }
+       }
+       
+       return bytes_received;
+}

diff --git a/Examples/I2C_simple_demo/I2C_simple_demo_slave/I2C_simple_demo_slave.ino b/Examples/I2C_simple_demo/I2C_simple_demo_slave/I2C_simple_demo_slave.ino
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+++ b/Examples/I2C_simple_demo/I2C_simple_demo_slave/I2C_simple_demo_slave.ino
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+#include <Wire.h>
+
+#define POT_PIN        A0
+#define LED_PIN        10
+
+#define SLAVE_ADDRESS  0x09
+
+void i2c_receive_handler(int bytes_received);
+void i2c_send_handler(void);
+
+volatile bool led_status = false;
+volatile uint16_t pot_value = 0;
+
+void setup()
+{
+       pinMode(POT_PIN, INPUT);
+       pinMode(LED_PIN, OUTPUT);
+       digitalWrite(LED_PIN, LOW);
+
+       Wire.begin(SLAVE_ADDRESS);
+       Wire.onRequest(i2c_send_handler);
+       Wire.onReceive(i2c_receive_handler);
+
+       Serial.begin(9600);
+}
+
+void loop()
+{
+       digitalWrite(LED_PIN, led_status);
+       pot_value = analogRead(POT_PIN);
+}
+
+void i2c_send_handler(void)
+{      
+       //Only for demonstration, never actually put Serial.print() in an ISR
+       Serial.print("Sending pot_value = ");
+       Serial.println(pot_value);
+       Wire.write((uint8_t *) &pot_value, sizeof(pot_value));
+}
+
+void i2c_receive_handler(int bytes_received)
+{
+       led_status = Wire.read();
+       // Ignore all bytes but the first
+       for (int i = 1; i < bytes_received; i++)
+       {
+               Wire.read();
+       }
+       //Only for demonstration, never actually put Serial.print() in an ISR
+       Serial.println(led_status ? "LED on": "LED off");
+}